Readout : A device that visually indicates a condition or voltage or current. Typical devices used in inspection requirements are galvanometers and CRT. (RP 5A5)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}